Composite Cathode Active Material for Stable High-Output Li-Ion Batteries
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Solution Overview
Problem
Existing lithium secondary battery cathode active materials face issues with chemical stability and ionic conductivity, leading to insufficient high output characteristics.
Innovation Solution
A cathode active material comprising first particles of lithium metal oxide with a specific cobalt molar ratio and second particles of lithium phosphate compound, in a defined weight ratio, to enhance chemical stability and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If NCM-based active material is used, then high output characteristics are achieved, but chemical stability deteriorates
Solution Approach 1:
The patent uses a composite cathode active material consisting of two distinct particle types: first particles (lithium metal oxide with controlled cobalt content) and second particles (lithium phosphate compound). This composite structure allows the first particles to provide high output characteristics while the second particles contribute chemical stability, resolving the contradiction between power and stability.
2Stability of the object's composition
If LFP-based active material is used, then chemical stability is improved, but ionic conductivity is reduced, resulting in insufficient high output characteristics
Solution Approach 1:
The composite structure combines second particles (lithium phosphate compound) that provide chemical stability with first particles (lithium metal oxide) that maintain sufficient ionic conductivity and output characteristics. The synergistic effect of the composite material resolves the contradiction between stability and power.
3Power
If cobalt content is increased to improve output, then high output characteristics are achieved, but production cost increases
Solution Approach 1:
The patent applies local quality by creating two distinct particle types with different compositions and functions. The first particles contain controlled cobalt content (y ≤ 0.10) optimized for output characteristics, while the second particles (lithium phosphate compound) provide stability. This localized functional differentiation allows cost-effective cobalt usage while maintaining high output performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The combination improves capacity, output, and lifespan characteristics of lithium secondary batteries while reducing production costs.
Implementation Method 1
The lithium secondary battery may store an electric energy by a difference in chemical potential when lithium ions are intercalated and deintercalated between a cathode and an anode
Data Source
Figure 1~2
AI summary
A cathode active material for a lithium secondary battery according to the embodiments of the present disclosure includes: first cathode active material particles which includes a lithium metal oxide containing nickel, cobalt and manganese; and second cathode active material particles which includes a lithium phosphate compound, wherein a molar ratio of the cobalt based on a total number of moles of the nickel, cobalt and manganese in the first cathode active material particles may be more than 0 and less than 0.15, and a weight ratio of the first cathode active material particles and the second cathode active material particles is 20:80 to 80:20. Accordingly, a lithium secondary battery having improved stability, capacity characteristics, and lifespan characteristics while reducing production costs may be implemented.